John l



@with tetta getraut @High JOHN. L. KNoWLToN, 0F PHILADELPHIAPENNSYLVANIA.- Letters Patent No. 73,536, dated January 21, 1868.

IMPROVEMENT IN -cIRcULAIt-SAW MILLS.

l-ts tlnhtle rtfemt tu in tigen sttnt'rtmt mit making pnt uffilgt time.

TO vALL WHOM IT MAY CON CERN:

Be it known that I, JOHN L. KNowL'IoN, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new andimproved Machine for Sawing Shipfl'i'mber; and I do hereby declare thefollowing to be a clear, exact, and full description of the same,reference being'had .to the accompanying drawings, vforming part of this.specificatiomand in whichl Figure 1 represents a top view of myinvention,`and

Figure 2 is a longitudinal vertical section of the same.

Y In this invention the saw is supported by a yoke which allows it to heinclined in any direction, verticalor horizontal, for the purpose` ofchanging thedirection or inclination of the cut. The'yoke is attached toa carl riage which feeds the saw to the log, 'the latterl simply movingbackward and forward in the same line fer all the di'erent cuts. y y

In the drawings, AA reprcsentthe frame of my sawing-machine, Brepresents the driving-shaft, andC C' D Dare the feed-rollers, the upperones, in each s'et C' D", being held in vertically-adjustable frames EE' regulated by a set-screw, e, and the lower ones in each set CDrotating on shafts c d, connected together by-a side. shaft, a, and.receiving their power from the driving-shaft-B, through 'the agency ofan intermediate driving. shaft, F, connected with the shaft B by a belt,b, and with the shaft c by a belt, c, all the belt-shafts being, ofcourse, provided with Vsuitable pulleys or drums. l" lhe object of theconnecting side shaft a gearing with the shafts c d, by mitre-gearwheels, is to impart the same .amount of motion inthe same direction tothose two -shafts and -their feed-rollers C D, upon which `thelog rests,and is carried backward and forward. The rollers C D are corrugated inorder to holdthe logv more firmly and prevent its slipping. Runningdirectly across the machine, fromside to side of the frame A, betweenthe feed-rollers C D, are two parallel ways, fw w, upon which, on trucksm m, runs a carriage, M, bearing the saws and its adjusting-apparatus..By means ofthis carriage the saw can be fed to the log without :thenecessity of .handling the latter., The carrie-'ge M supports ayokeframe, N,`hinged to the-carriage at -the endinearest to the saw byhinges nn, and at its opposite end supported by an Aadjusting-screw rod,O, by which it can be caused to take any requiredincliriation to thecarriage-frame. Above this yoke-frame, and resting upon it, is anotheryoke-frame, R, of similar shape, and pivoted to the yoke N by a verticalpivot, r, directly under the bearing s of the saw-mandrel S'vnearest tothe saw. This arrangeA ment enables the saw, the mandrel of whichbearsvin boxess s' {ixedt'o the yoke R, to be turned in differentdirections by moving the yoke B. horizontally on itspivot. lever, L,with a connecting-rod, l, furnishes -the means by which the yoke canthus be moved instantlywhen itis required tochange the direction ofthesaw-cut. This comprisesV all the arrangements necessary to regulate theposition and out of the saw, to make it out at 'I any inclination orbevel, in any direction, and at any thickness ofcut, and to'enable theoperator v'to change the direction, inclination, and feed of the saw, atpleasure. AAt `thehecl of the saw is a wedge-roller, P, for the Ausualpurpose of widening the kerF. The journals of the wedge-roller beur inlugs projecting upward from the yoke R, and thereforeit always maintainsthe same'relative position to the saw, The wedge-rollen also has a:lateral movement onitsj-ournals to accommodate the turning of the saw.`i

In order to prevent the belt 'I' from running oifof the drum T', bywhich motion is imparted to thesaw-mandrel from the main working-shaft,and to keep it at the proper tension, two small pulleys or drums, V V',are provided, bearing in lugs, 1w', depending from the under side of thelowerryoke N. The belt passes over these pulleys and around the drum T',in the manner shown in the drawing, running between the lugs A1) v', bywhich it is held in place,l and running within the sides of theyokes.The total distance traversed'by the belt Ul will thereforel be constant,whatever be the position of the mandrel and saw, and the tensionof thebelt will alwaysv be equal. i

As it is not desirable that the feed-rollers should valways bein motion,the shaft F, by which they are put i in motion, as above described,bears ations end in a beam, Y,Ypivoted at its rear end to the frame A,and connected at its forward end by means of a. conneotingrod, z, to alever,'Z. By tho lever Z, the belt a may be tightened so as to work thefeed-rollers, or slaeked so as to impartno motion to them. y Having thusdescribed my invention, what I claim as new, and desire to Secure byLetters Patent, is

1. The combination and arrangement ofthe carriage M and yokes N and R,or their equivalents, the latter bearing the circular saw S, when tlieports are so constructed and arranged that tlieyo'lre Rrests upon theyoke N, and the latter is pivoted to the carriage, so that the saw canbe moved to and from the log, or inclined in any direction, the carriagebeing at liberty' to move back :und forth :is the inclinationof the sawmay require, and

Without the aiil of any mechanical arrangements, substantially in themanner and for the purpose specified.

2. The combination of the wedge-roller P with the yoke R, andconstructed with lateral movement i-n such a. manner as to:tllowvangular niovcmcnt of the saw-mandrel without disturbing itsrelative position with the log.

' JOHN L. KNOWLTON.

Witnesses: C. B. POTTENGEB, .J 051m; A. TURNBULLL

